The effect of angled insertion on halo pin fixation.

Abstract:

:This study evaluated the effect of angled insertion of halo pins on the biomechanical characteristics of the halo pin-calvarium complex. Halo pins were inserted into isolated calvarium sections at 90 degrees, 75 degrees, and 60 degrees to the surface of the bone at an insertional torque of 0.68 N-m (6 inch-pounds). Initial rigidity, load at failure, and deformation at failure of the pin-bone complex were assessed during transverse shear loading. The structural properties of the pin-bone complex were maximized at loads approaching failure when pins were inserted perpendicular (90 degrees) to the bony surface and significantly decreased at more acute angles of insertion. Perpendicular insertion of halo pins maximizes the structural properties of the complex formed by the halo pin and the calvarium. This improved structural behavior may minimize the incidence of pin loosening clinically, and may reduce the frequency of other complications currently associated with the use of the halo orthosis.

journal_name

Spine (Phila Pa 1976)

journal_title

Spine

authors

Triggs KJ,Ballock RT,Lee TQ,Woo SL,Garfin SR

doi

10.1097/00007632-198908000-00001

subject

Has Abstract

pub_date

1989-08-01 00:00:00

pages

781-3

issue

8

eissn

0362-2436

issn

1528-1159

journal_volume

14

pub_type

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